/**
 * field_files
 */
layui.define(['YunjField','yunj','upload'], function (exports) {

    let YunjField = layui.YunjField;
    let $ = layui.jquery;
    let upload = layui.upload;

    class YunjFiles extends YunjField {

        constructor(options={}) {
            super(options);
            // 上传操作元素elem
            this.upload_action_elem=`#${this.id} .files-upload-box .upload-action-elem`;
            // 文件预览容器dom元素对象
            this.files_preview_box_el=null;
            // 上传文件
            this.upload_files={};
            // 上传进度的数据
            this.upload_progress_data={};
            // 上传进度的定时器
            this.upload_progress_timer={};
        }

        defineExtraArgs(){
            let that = this;
            return {
                max:9,
                size:yunj.config("file.upload_file_size"),
                ext:yunj.config("file.upload_file_ext"),
                disabled:false
            };
        }

        layoutControl() {
            let that = this;
            let controlHtml = `<div class="files-upload-box">
                                    <div class="files-select-box" title="${that.args.disabled?'禁用':'选择文件上传'}">
                                        <i class="layui-icon layui-icon-upload"></i>
                                        <span>文件上传</span>
                                    </div>
                                    <i class="upload-action-elem"></i>
                                </div>`;
            return `<div class="layui-input-inline yunj-input-inline">${controlHtml}</div>`;
        }

        // 设置字段简介
        layoutDesc() {
            let that = this;
            return `<div class="yunj-form-item-desc">允许上传大小不超过 ${that.args.size}MB 且格式为 ${that.args.ext} 的文件，允许最大上传数 ${that.args.max}。${that.args.desc}</div>`;
        }

        setValue(val=''){
            let that=this;
            that.set_files_preview_box_layout(val);
        }

        getValue(){
            let that=this;
            let files=[];
            $(that.files_preview_box_el).find('.files-preview-item-box').each(function () {
                let name=$(this).find('.files-preview-item-input').val();
                if(!name||!yunj.isString(name)||name.length>2000) return true;
                let url=$(this).find('.files-preview-item-action-box .files-item-download-btn').data('url');
                if(!url||!yunj.isString(url)||url.length>2000) return true;
                let file={name:yunj.fileNameExt(name,url),url:url};
                files.push(file);
            });
            return files;
        }

        set_files_preview_box_layout(files=''){
            let that = this;

            if(!that.files_preview_box_el){
                that.fieldBoxEl.find('.files-upload-box').prepend('<div class="files-preview-box"></div>');
                that.files_preview_box_el=that.fieldBoxEl.find('.files-upload-box .files-preview-box');
            }

            let content='';
            for(let i=0,l=files.length;i<l;i++){
                let file=files[i];
                content+=`<div class="files-preview-item-box">
                                <input type="text" class="layui-input files-preview-item-input" value="${file.name}" placeholder="文件名称" ${that.args.disabled?'readonly':''}>
                                <span class="files-preview-item-action-box">
                                    <i class="layui-icon layui-icon-download-circle files-preview-item-action files-item-download-btn" title="下载:${file.name}" data-url="${file.url}"></i>
                                    <i class="layui-icon layui-icon-delete files-preview-item-action files-item-delete-btn" title="${that.args.disabled?'禁用':'删除'}"></i>
                                </span>
                            </div>`;
            }
            that.files_preview_box_el.html(content);
        }

        add_files_preview_box_layout(){
            let that=this;
            let content='';
            for(let index in that.upload_files){
                if(!that.upload_files.hasOwnProperty(index)) continue;
                let name=that.upload_files[index].name;
                content+=`<div class="files-preview-item-box" data-index="${index}">
                                <input type="text" class="layui-input files-preview-item-input" value="${name}" placeholder="文件名称" readonly>
                                <span class="files-preview-item-action-box">
                                    <i class="files-preview-item-action files-preview-item-upload-progress">0%</i>
                                </span>
                            </div>`;
            }
            that.files_preview_box_el.append(content);
            for(let index in that.upload_files){
                if(!that.upload_files.hasOwnProperty(index)) continue;
                that.upload_progress_start(index);
            }
        }

        // 设置上传进度数据
        set_upload_progress_data(index,args={}){
            let defArgs={
                elem:null,
                rate_num:0
            };
            args=yunj.objSupp(args,defArgs);
            let that=this;
            if(!that.upload_progress_data.hasOwnProperty(index)) that.upload_progress_data[index]=defArgs;
            that.upload_progress_data[index].elem=that.upload_progress_data[index].elem || that.files_preview_box_el.find(`.files-preview-item-box[data-index=${index}]`);
            that.upload_progress_data[index].rate_num=args.rate_num;

            that.upload_progress_data[index].elem.find('.files-preview-item-upload-progress').html(args.rate_num+'%');
        }

        // 上传开始
        upload_progress_start(index){
            let that=this;

            that.set_upload_progress_data(index,{
                rate_num:0,
            });
            that.upload_progress_timer[index]=setInterval(function () {
                let rateNum=that.upload_progress_data[index].rate_num;
                rateNum = rateNum + Math.random()*10|0;
                rateNum = rateNum>99?99:rateNum;

                that.set_upload_progress_data(index,{
                    rate_num:rateNum,
                });
            },300+Math.random()*1000);
        }

        // 上传结束
        upload_progress_end(index,data){
            let that=this;

            clearInterval(that.upload_progress_timer[index]);

            that.set_upload_progress_data(index,{
                rate_num:100,
            });
            let name=data.fileName;
            let url=data.url;
            that.upload_progress_data[index].elem.find('.files-preview-item-input').val(name);
            that.upload_progress_data[index].elem.find('.files-preview-item-input').attr('readonly',false);
            let actionBoxContent=`<i class="layui-icon layui-icon-download-circle files-preview-item-action files-item-download-btn" title="下载:${name}" data-url="${url}"></i>
                                  <i class="layui-icon layui-icon-delete files-preview-item-action files-item-delete-btn" title="删除"></i>`;
            that.upload_progress_data[index].elem.find('.files-preview-item-action-box').html(actionBoxContent);
            setTimeout(function () {
                that.delete_upload_item_data(index);
            },1000);
        }

        // 上传错误
        upload_error(index,tips=''){
            let that=this;
            if(!that.upload_progress_data.hasOwnProperty(index)) return false;
            if(tips.length<=0) return false;
            let actionBoxContent=`<i class="layui-icon layui-icon-speaker files-preview-item-action" title="${tips}" style="color:#FF5722;"></i>
                                  <i class="layui-icon layui-icon-delete files-preview-item-action files-item-delete-btn" title="删除"></i>`;
            that.upload_progress_data[index].elem.find('.files-preview-item-action-box').html(actionBoxContent);
            that.delete_upload_item_data(index);
        }

        // 删除上传数据
        delete_upload_item_data(index){
            let that=this;
            if(that.upload_progress_timer.hasOwnProperty(index)){
                clearInterval(that.upload_progress_timer[index]);
                delete that.upload_progress_timer[index];
            }
            if(that.upload_progress_data.hasOwnProperty(index)){
                delete that.upload_progress_data[index];
            }
        }

        // 设置上传事件绑定
        set_upload_event_bind(){
            let that = this;

            let args={
                elem:`#${that.id} .files-select-box`,
                url:'/file/upload.html?from=input',
                accept:'file',
                exts:that.args.ext.replace(/,/g,'|'),
                auto:false,
                bindAction:that.upload_action_elem,
                field:'file',
                size:that.args.size*1024,
                multiple:true,
                drag:false,
                choose:function (obj) {
                    if(!yunj.isObj(that.upload_files)||!yunj.isEmptyObj(that.upload_files)){
                        yunj.msg('待上传完成后，执行此操作');
                        return false;
                    }
                    that.upload_files=obj.pushFile();

                    // 判断是否超过限制数量
                    let count=(that.files_preview_box_el.find('.files-preview-item-box').length | 0)+(Object.keys(that.upload_files).length | 0);
                    if(count>that.args.max){
                        yunj.msg(`限制最大上传数 ${that.args.max}`);
                        for(let idx in that.upload_files){
                            if(!that.upload_files.hasOwnProperty(idx)) continue;
                            delete that.upload_files[idx];
                        }
                        return false;
                    }

                    that.add_files_preview_box_layout();
                    $(that.upload_action_elem).click();
                },
                done:function (res, index, upload) {
                    delete that.upload_files[index];
                    if(res.errcode!==0){
                        that.upload_error(index,res.msg);
                        return false;
                    }
                    that.upload_progress_end(index,res.data);
                }
            };

            upload.render(args);
        }

        defineExtraEventBind(){
            let that=this;

            if(!that.args.disabled){
                // 上传
                that.set_upload_event_bind();

                // 删除
                that.fieldBoxEl.on('click','.files-preview-item-box .files-preview-item-action-box .files-item-delete-btn', function (e) {
                    $(this).parents('.files-preview-item-box').remove();
                    e.stopPropagation();
                });
            }

            // 下载
            that.fieldBoxEl.on('click','.files-preview-item-box .files-preview-item-action-box .files-item-download-btn', function (e) {
                let name=$(this).parent('.files-preview-item-action-box').prev('.files-preview-item-input').val();
                if(!name||!yunj.isString(name)||name.length>2000) return false;
                let url=$(this).data('url');
                if(!url||!yunj.isString(url)||url.length>2000) return true;
                name=yunj.fileNameExt(name,url);
                yunj.download({name:name,url:url});
            });
        }

    }

    exports('field_files', YunjFiles);
});